Names of 21998
| Nominal | 21998 |
| Cardinal | twenty-one thousand nine hundred ninety-eight |
| Ordinal | 21,998th |
| This number as US currency | twenty-one thousand nine hundred ninety-eight dollars |
| Is 21998 an odd number? | 21998 is NOT an odd number |
| Is 21998 an even number? | 21998 is an even number |
| Is 21998 a palindrome? | 21998 is NOT a palindrome number |
| Is 21998 a triangle number? | 21998 is NOT a triangle number |
21998 in other Bases
| Base 2 (Binary) | 1010101111011102 |
| Base 3 (Ternary) | 10100112023 |
| Base 4 (Quaternary) | 111132324 |
| Base 5 (Quinary) | 12004435 |
| Base 6 (Senary) | 2455026 |
| Base 8 (Octal) | 527568 |
| Base 12 (Duodecimal) | 1089212 |
| Base 16 (Hexadecimal) | 55EE16 |
| Base 20 (Vigesimal) | 2EJI20 |
Primes and Factors tests for 21998
| Is 21998 a Prime Number? | 21998 is NOT a prime |
| Is 21998 a perfect number? | 21998 is NOT a perfect number |
| Is 21998 a Mersenne Prime? | 21998 is NOT a Mersenne prime |
| Is 21998 a Fermat Prime? | 21998 is NOT a Fermat prime |
| Is 21998 a Fibonacci Prime? | 21998 is NOT a Fibonacci prime |
| Is 21998 a Partition Prime? | 21998 is NOT a Partition prime |
| Is 21998 a Pell Prime? | 21998 is NOT a Pell prime |
| Prime Factors | Prime factors of 21998 |
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21998 in other Numerals
| 21998 in Roman Numeral | XXMCMXCVIII |
| 21998 in Chinese Numeral | 貳萬壹仟玖佰玖拾捌 |
| 21998 in Egyptian Numeral | 𓂮𓆼𓍪𓎎𓐁 |
| 21998 in Babylonian Numeral |   |
Roots and stuff for 21998
| Is 21998 a square number? | 21998 is NOT a square number |
| Is 21998 a cube number? | 21998 is NOT a cube number |
| Square root of the number 21998 | 148.31722759005 |
| Cube root of the number 21998 | 28.019544177995 |
Recreational math for 21998
| Number 21998 reversed | 89912 |
| Sum of the digits | 29 |
| No of digits | 5 |